Describe the alimentary canal of man.

Describe the process of urine formation in kidneys.

1. List the three events that accur during the process of photosynthesis. Explain the role of stomata in this process.
2. Describe an experiment to show that ''sunlight is essential for photosynthesis.''

Draw a schematic representation of transport and exchange of oxygen and carbon dioxide during transportation of blood in human beings and label on it, Lung capillaries, Pulmonary artery to lungs Aorta to body, Pulmonary veins from lungs.

1. Draw a sectional view of the human heart and label on it, Aorta, Right Ventricle and Pulmonary Veins.
2. State the functions of the following components of transport system:

1. Blood.
2. Lymph.

Breathing cycle is an essential process for the exchange of gases’. Justify this statement.

The partially digested food coming from the stomach of a person enters a long and narrow organ A in his body. The organ A receives the secretion of two glands: liver and pancreas. Liver secretes a greenish - yellow liquid B which is normally stored in the organ C. Pancreas secretes pancreatic juice which contains three digestive enzymes D, E and F. The intestinal juice completes the process of digestion of food. The inner wall of organ A has millions of tiny finger - like projections G which help in the rapid absorption of digested food into blood stream. The undigested part of food then passes into wider tube H which absorbs most of the water from undigested food. The last part of tube H called I stores this undigested food (or waste) for some time. The undigested food is then passed out though opening J as faeces in the process known as K.

1. Name the organ A.
2. Name liquid B and organ C.
3. What are the digestive enzymes D, E and F?
4. Name the projections G present on the inner wall of organ A.
5. Name Tube H, Part I, Opening J and Process K.

Distinguish between photosynthesis and respiration.

Draw a labelled diagram of the human digestive system. With the help of this diagram, describe the process of digestion of food in man (humans).

Distinguish between aquatic and terrestrial respiration.